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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6a766d78dd20713d416944a83465a945068c3952478df1bd18569f148c44f4' 
  AND token = 'O7gj4fRnT7h2LohLyfJeq9IcaIRrM2WCdEpKgx1CygE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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