SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c01d6db394918bbbd651fa3c3cd418424e5786e23c09e7aaa097707c6c4a0926' 
  AND token = 'yFEIgOn/itjpbIgHpHRBfuiPGlGeiKm215FhTytkZ+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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