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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ae8994d7810cea0af3c73a08a703c56b3de3294675f8bce3e5c34cb10c3bcc3' 
  AND token = 'L9+ILJaaeu/Pxx8FKLr2MIPTs2Y46HfPAlEie86C1M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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