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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7a5036cce2b79cd607e8de39d193ae52240cd8cca8c0283be1740b14331537c' 
  AND token = 'biQNVQ5VZLM+yiIO2thzx0QA0QB3i+Xdlz8y/nQTTEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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