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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d22bfee77250be82630ceff8c6697237c825f5effeeea62fcfb1cd2b9a6557b' 
  AND token = 'zN8ak9M2OlQ3eV8VuvUAqIP2GTBn8fkb096VTCldUXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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