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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce967e237159024ad5805804713227dd5bb7cb56ec9d9f2d2a62ee0ca358a50c' 
  AND token = 'tFypeCiGtbQXUOQYQBWZu3qTnngCxt1GXAhgFvLOqZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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