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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03bae6e1f19bf8e03d4ef03d173d3784379f6ccfcd38cbb4f54a554ea3ae5ffc' 
  AND token = 'cmFnznmCSEPyhsmHmxXAai+9mxY1u7w63c5OTHZ0WJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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