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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9150c1b3a63545dba4688b6c08c11beec7242996db5ebefc7fa37e127164e8d' 
  AND token = 'nG6lunUm+0hQsyjBapk/I4hcPDz6cUBvCjM8ffWEr84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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