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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a1d09f7b78fc341c4f767b5f3c2d872e557d6b004313fb0419ac666f41e6719' 
  AND token = 'ZDnYACVMAlD90adOnOMthkwNOAPtBqNciUWgha85BM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}