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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72a4163064345538734a0070135bb949eb0e1c5345c2084a309a33ea6339b057' 
  AND token = 'mdbZN1rP9OFtXxqOfeQQjKiBx7lkutbRtqAurCAb3ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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