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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037f82d6ec73a673bf5e955b37059751cbae9a5f26d579123c89f3169db4d1c0' 
  AND token = 'FRyweMtzbsrF6NCwqhCyKaCR3bSxlXa/N5wke0cTS7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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