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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c832d3fd46873b2567be11f9521c1f780aa11e0f63d2a66f22aa5dd5a607b6' 
  AND token = '68Zk3pPNu/dhTEYZ9X3J0y4zvC5iQOo2jJUEUxphT6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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