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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5140486428c2823ba4880ebe00458d76844d5a3f8cf5b572d42d763306cc19e5' 
  AND token = 'o7y6isMfwoXat3fYjQ3ZA80VfX1WkoBC7UWnY41+OnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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