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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04369098162b6e362dcc9c8af763c5c63abdb743190740ab5a4719040c1a3850' 
  AND token = 'Q7zvwaoVX9tvuBNkSKRo1Tlv82NVfXDMwjLupIy1F+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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