SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88df75d7d2c7976e69a1ae8987d4ad149afd0f3eed283902a852309b5fac2c17' 
  AND token = 'PeZSlM+qlYjNrD9Vn/7ibZhETN6wyJpBojIhhU35R9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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