SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d46adc11cc617c0b98e23d54914cf6c6ecf3a98ebc51a067e83ff7f0dc639db' 
  AND token = 'JbRYAZ8Hs7S4x4+KZwXKMZyv+8GWqER15jl9R/lDP/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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