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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebfa4587ee78a77dfbc246eb5c1701c655ce6d58284f6d148d7fbbb2c6d29725' 
  AND token = 'QBRzjCzZjUwtO/zuk5awzU5Dbd56y7JQCVFpOUI5KxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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