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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0756b64211473da892390f753b8ebf19cef73a384b768513880ae24cd1aabc' 
  AND token = '1zPbon8R4CsmbzAYS3LKsIUHO/TrEaDS/0qHlVUlqf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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