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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf8784fc1f329a9ea52e8ab2ade0bdffbffa57333f3715f164b03eecdb8f6ce' 
  AND token = 'b32BRfw+wa3g4BuyHEjbyeKE07woe8GZYjmnNGvWN6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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