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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768b49832420a0a04216899842f74b24ad7fbccc9cadd5d449d58efacc8910b9' 
  AND token = 'im/NGeG0M8aqVLlxSV8p8P9Ej7RJxJTkE2V4YBdSeVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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