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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3ecbb99c392ef6e8720ec565d650abf0a9c91dd3cfa416939b37c35b28e158' 
  AND token = 'kZc6ya8+aKpkocdb5y5IPPMrk6p9GqUysqJJMIGnyWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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