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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d0dec19366840cb053bd1ab730f9803dd0304d0ab62f64976c75a85b08ae1d' 
  AND token = 'WcoPYLKJpHhsrocFjk97e2fI1GzizPCejfbQSNrFDig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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