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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbab5944bae21668a6c8cc6a2b9bef6fe867d2af29ca35a47b69bbb12cf3aa19' 
  AND token = 'DjNDiQi8yE6/TG/EG8oUncbvi0B/hKK602WqcvcQ5MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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