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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418340db03c3fd9874e9ee6fdad4afc1a286c48c280d1cec32dee91c33395627' 
  AND token = 'EE9l5lBA+A4JMY75G7DGtWepNpZrV3LLt1sLACPi/SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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