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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8dec4e2e317204b40e5ae0d0d6fabfb31d86e51f614e3cdf9d45109fb9388b' 
  AND token = 'LWuBgesMToUGATk9oWKR/T6oVbBXjxHW4HsUgzyZqgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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