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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de32932034aabf0dd4c5eb5f3b5b59a0ce82137a888ce70193cf0300e70fe47' 
  AND token = '9VmrFgLqNznNEmsZPjoPMWlZTlqwyj3AJU//jg1+y8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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