SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '988782fe1bd625cc33dd8ac0e46e0ad09c0f0239d29558f8d6f2b93a0f00ffb5' 
  AND token = 'nEJ/1LEglZVs+AiBf6vUEKuqk73TC57othjNX43PmQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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