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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df974fa91195ff2c4ffe5a36a323ea790a5f6321096563aff5f6acf4f46f8cfb' 
  AND token = 'W/kQecwLGdd8wJFhGH71Ck7LFWyz4QiFGWsYuht4LYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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