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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '842a3090c4aba48eb221326b674925535f523d5f4209e7b0a0c4802c8cbfd73c' 
  AND token = 'cUan8ZM8V4O3ya24f/mU4VKt+ju9V+/7zqy7OJZXbPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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