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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01279031d9a795bc5d4166d96242893e2e71de8aa10b206dc1e2e227a8557b88' 
  AND token = 'grdQrQ806yAexPhmRzZS5uYaBVQa5f7ImLupAzNVa6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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