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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ab5a222951cd523cb690fbea7ed4fd553d6488ddd983cdc7ec7420261249e5b' 
  AND token = 'v/o729DQRFtI7EiVZnY70XaVY/g+LtyJvE2nVP5N+RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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