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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f6b688ae689d5d771f3889bb09951cca2a94c5d142c6050ffc39fbfe2f6c0c' 
  AND token = 'UbV1a5NLGr78S+AN7MskqS42qV9ZvnouJ517ndvw3o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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