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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b583141e36d391f6af7bb10077f2a430559d7bd03ca083c34ccfd8768db71b1a' 
  AND token = '2JDmV/3EbvH4fe8Ob5YIOIcWuoGnW0RK643i4LNVDdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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