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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '196db93bff5033a06e93f0b628b8ebc9a018b4c5153882f4c4441e9e2a62aafa' 
  AND token = '8pQSCOhpn6h+W5v40YhGIxfnnD1RU90+RfhRGcJTnCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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