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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2194669b316446b5d7d9d7f1fec0ce92ca92ddc2f29e2fd9a6147b571ae7b1fe' 
  AND token = 'q6oJkSb8IlWZ9OfcFgLlKg1+z755yEDhMGw9K9gF2Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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