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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9463111a52f1931eac055a08300c6c162b6a086b72540690e19a5d0d2534bbcf' 
  AND token = 'mi/BVsR0A5tAccN3gVGevBkQaMHx9f3Ewtbe7jp5JZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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