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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f3dc1bfc8e633c66da00653054631a7a810cc31e0a3d2d2253605e9dbeeb43' 
  AND token = '9uHkrdTrvl4kkChcPKhER8eT/k+PK9t/aNmt2gx5iFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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