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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb62b0e3882c551e4c688d22a45aa6279ce85704a0cc5d455d8035c93f53ecff' 
  AND token = 'V369WFCVruXNww7cIano78AgVXjdsk9/4iotv52Anj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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