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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2c82aafd686af6df9aad887023ac400f5513ea9df13e436e25e801a49c62d6' 
  AND token = 'vY2hVUcG3hgfWlUmg6WAMIjaG2tEhawF5r6J62Cqb+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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