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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89ba6d699d4b4f4da899556f72c59f1256bec7801da72cca65eff81f2b0984f' 
  AND token = 'mZI5r8JbsJv5HFtHb0MueqBMSVOP9ix+wewgBqV5Xek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00317

JSON explain

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