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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7f367690ca2892579d9ead3de705e97c760e6be3a21028c873eaee8a0cf037b' 
  AND token = 'tENFUzPrD7OHt1k9PeZhedFZNMIm5ZCIPLVR2CBg6v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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