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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa6cf6c0069c6f562ff9dcc445dae2fcfa56a2f4ab35bf5af946c76dabac94c' 
  AND token = 'TFhdiSU8VicZg/RmXjgAULIyDWTvjmK5NZxAbRTBiz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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