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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad365faf72b02018a32627235796e6ed63aa1799cc8284c5dd3b3c11164ade9d' 
  AND token = 'GMq16X886QOTO4UiSq/HQWw2j8EYhip6voaj6CKMYPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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