SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bcba742ca2b826782d3c0d18aff046923806505b9dc323073b435d50294f0e9' 
  AND token = 'GtKHds10KC+JDC2Bw5dBaFv6Ye0vmXRSjH0/q/dBNKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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