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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf685a177bd839e9918985278e69c1050afddc2facb8cb340e5ec7026bba1f1d' 
  AND token = '5vuxa0GJ4ZenERpclbZmmIH4kmkYvE5WImk2OV7PxUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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