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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93dd0bf52f6e7a144966b459a31e43b3b1b5403d7b20b72f15826e52fef7a0bf' 
  AND token = 'z1+XDAlo2wxLzz4K0qnGwjRIc/L8t1bMTJcPQbCrFFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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