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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ce8a87d445a5e6d4c3cf07bc034d8766ffc41a6f910fe507e58627a9483837e' 
  AND token = '/yxFwT2/Y+X3KB0C9M/5G9KNk+O8ZtJ8vlesATMKA8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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