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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aaec2b5e302cd9ef1b1cf14a52c433c94b97bc79779b1831c1064497fbbd43f' 
  AND token = 'eTXtCA+lzODWVkowOuCgdJs1JH2kSGUx9lnlwX+mb/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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