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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a3a2e33b70409dd807ad685f6d5bcee30e0c4579e4ce926a52a6df1ba6f1c17' 
  AND token = 'kqRlpxKtReawyIdNl4lAhgEu+N0g+6vi9YfCQpVT9LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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