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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0765e5147e48f6f4153b65d8ad1c6c68790806c1c0dedb02135359f46337db06' 
  AND token = 'PqOO6elZqiK5ZJdT17gyr8hZEY2w8AORySr++xzAy6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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