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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffe011051d7eb9ff08fad13fab42a0aa3252db1d6f80d2987d129ea8c785ab1e' 
  AND token = 'sUrfRuBOINLzLRWEI/M4llpyPVkTiS6bQI7Trqj5WUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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