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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd031061b04caad982908bdabe9a26b2d96e90da4cd77881b726c2a5f3760e220' 
  AND token = 'obrqct/OGnnG0KcWevhO73EhLA6c+yLNtSmPnxN7NOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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