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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1da227097a0ef7aa521b8679b897c4530f94cd721f7845bd9d493bbd679cec' 
  AND token = 'dRckImbWSeEf6MOxIqxCJ7wbY7tyAMIy8zNmEuuJekk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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