SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0883c36172664f7089c5bae35c438ffe47659f5eaf97906eba7da209cf5dccbb' 
  AND token = 'Jqmo98z3Wy9JKQy9/U4iBdp2ginZxPPymBV39wgxUKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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