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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c338a077b7dfac3aa811a5a8da9f17b3e82dade1bf8fea65f7ba0621e4c8a3cb' 
  AND token = 'DUfNCaD3PRIKgfFlAjqxmszvX1Q66gcRmeHH81df6sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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