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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1456174c8110ec51b07d6340c6fdf21792b869f498bcc03efd148d42d26f774d' 
  AND token = 'a8MS9VoZ3aPOh1cazeEQSi6whPDL/tKyfNses0FVWr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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