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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5666a31d8ab49d773c343bed7b2a2ca2fa8b039ae3136edb152541424edbf18' 
  AND token = 'mKKk6qBHZxMgm12mwxq2wr7QS8OOzS2YhtiwFlboDns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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