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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e69b49eccc70c555f3e1216afe24443bb64c7084dc7feea33c6181cc6d5fbc7c' 
  AND token = 'JrnG0XqiuRuSq7bycbbE+xKxPs8aHy9s8D2aDnSh16M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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