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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3626c088f509796e832ba25bd92f4f1c76b5cca06e9b06347b222e7f2b7a6d8' 
  AND token = 'o7vfyBGD2Sjt6gtd4KnuobWFHXxKSO70WhK94BUPbpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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